Unit of UDF

Hello First, thank you to take time for reading this. I need some informations: I'm using a UDF that return a Source term (a mass). In the book, they said that the unity of the mass is : kg/m3-s... I'm in an unsteady simulation, and I'm injecting a constant mass ( in my function for exemple source = 500.) Does it mean, that if I had a time step of 0.01 seconde, my function will inject 5kg? Hope my question is enough clear. Thank you